JST to SST Converter
Convert time between Japan Standard Time (JST) and Samoa Standard Time (SST)
Japan Standard Time (JST)
Samoa Standard Time (SST)
Time Difference
Samoa Standard Time (SST) is 0 hours ahead of Japan Standard Time (JST)
Select Date
Select Time
Quick Reference
| JST | SST |
|---|---|
| 11:00 | 15:00 |
| 13:00 | 17:00 |
| 15:00 | 19:00 |
| 17:00 | 21:00 |
| 19:00 | 23:00 |
| 21:00 | 01:00 |
| 23:00 | 03:00 |
| 01:00 | 05:00 |
| 03:00 | 07:00 |
| 05:00 | 09:00 |
| 07:00 | 11:00 |
| 09:00 | 13:00 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
About JST to SST Time Conversion
Converting time between Japan Standard Time (JST) and Samoa Standard Time (SST) bridges East Asia and the South Pacific. JST is UTC+9 and SST is UTC-11, making SST 20 hours behind JST. Both timezones are stable year-round — Japan has not used DST since the early 1950s and American Samoa never observes daylight saving — so the 20-hour offset is identical every day of the year, with the international date line in between.
This converter uses the IANA timezone database (Asia/Tokyo) to give accurate results. Whether you're booking a call between Tokyo or Osaka and Pago Pago, coordinating with Pacific-based teams from Japan, or planning travel via Tokyo, the tool removes the manual offset arithmetic for what is effectively a near-full-day shift.
Common Use Cases for JST to SST Conversion
Business & Work
- Scheduling video calls between Tokyo, Osaka, or Yokohama and American Samoa
- Coordinating Japan–Pacific logistics, fisheries, and maritime operations
- Planning conference calls that bridge Japanese and Samoan working hours
Personal & Travel
- Calling family in American Samoa from Japan
- Planning travel itineraries connecting through Tokyo to the Pacific
- Coordinating watch parties for live NPB baseball, J-League, or anime broadcasts
Time Zone Information
Japan Standard Time (JST)
- UTC Offset: UTC+9
- IANA Timezone: Asia/Tokyo
- Daylight Saving: None - Japan does not observe daylight saving time
- Major Cities: Tokyo, Osaka, Yokohama, Nagoya, Sapporo
- Coverage: Japan
Samoa Standard Time (SST)
- UTC Offset: UTC-11
- IANA Timezone: Pacific/Pago_Pago
- Daylight Saving: None - American Samoa does not observe daylight saving time
- Major Cities: Pago Pago, Tafuna, Nu'uuli, Faleniu, Aua
- Coverage: American Samoa and Midway Atoll
Quick Reference: JST to SST
Remember: SST is always 20 hours behind JST. Neither side observes daylight saving, so the offset is stable year-round.
Frequently Asked Questions
What is the time difference between JST and SST?
Japan Standard Time (JST) is UTC+9, while Samoa Standard Time (SST) is UTC-11. SST is 20 hours behind JST. When it is 12:00 PM in Tokyo, it is 4:00 PM the previous day in Pago Pago.
When does this JST to SST conversion apply?
It applies year-round. Japan has not used DST since the early 1950s, and American Samoa never observes daylight saving, so the 20-hour offset is stable in every month of the year.
How does the time difference change throughout the year?
It does not change. JST stays on UTC+9 and SST stays on UTC-11 year-round. The 20-hour offset and date-line crossing make this conversion close to a full-day shift.
What are the best times for JST–SST business calls?
A 20-hour gap with the date line in between is effectively a full-day shift, so business hours rarely overlap. Treat handoffs as next-day rather than live calls: end-of-day in Tokyo lands at the start of the previous calendar day in Pago Pago.
Which countries and regions use SST?
Samoa Standard Time (UTC-11) is used in American Samoa and the uninhabited Midway Atoll. The independent state of Samoa is on UTC+13, on the opposite side of the international date line. Major American Samoa locations include Pago Pago, Tafuna, and Nu’uuli.
Which countries and regions use JST?
Japan Standard Time covers all of Japan. Major cities include Tokyo, Osaka, Yokohama, Nagoya, and Sapporo. Japan has a single timezone for the entire country and does not observe daylight saving.
Pro Tips
- • SST is always 20 hours behind JST — no DST on either side, so the offset is rock-solid year-round.
- • A 20-hour gap with the date line in between means business hours rarely overlap — plan asynchronous handoffs.
- • Always confirm the date because of the international date line — JST is almost always one calendar day ahead of SST.
- • No seasonal shift to worry about — recurring meetings will not drift twice a year.
- • For live calls, very early morning JST (6:00–8:00 AM) maps to late morning SST the previous day, but this requires one side to be flexible.
- • For one-off calls, double-check the IANA zones (Asia/Tokyo, Pacific/Pago_Pago) in your calendar tool.